Means for and method of



MEANS FOR AND METHOD OF APPLYING CQATINGQ APPLICATION FILED DEC. 30. 191B.

2 SHEETS'SHEET I.

1,311,760. r Patented Ju1 29, 191g.

' Hart OlDavzJs.

by M, 6 WVCY and delicate parts,

invention is adapted to fine Work; ,25

ing Coating,

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UNITED STATES PATENT OFFICE.

HARRY o. DAVIS, or IPSWICH, MASSACHUSETTS, ASSIGNQR To SPRAY ENGI EERING COMPANY, OF BOSTON, MAS$AGHUSETTS, (3OlEtIOItA'IION'v OF MASSACHUSETTS.

. MEANS For; AND METHOD or APPLYING COATING.

means, or it may be a solid in powdered form, and the material to which it is to be applied may be of anysuitable character,

such, for example, as wood or metal.

One important object of niy invention is to provide anrindu strial tool which may be readily used in rough work not requiring a great nicety of manufacture norcostly Obviously, however, the

Referring more particularly to thedrawing wherein I have represented a single embodiment ofmy invention and, one form of means for practising my 'method,'

Figure 1 is a plan view of a tool construct ed in accordance with my invention where y m o m y b practised;

' in said figure; and

I resenting the parts as differ-e Fig. 2 is a sideelevation thereof;

Fig. 3 is a vertical, central, sectional view thereof, 4

. Figs. 4 and 5 are transverse sections upon the lines 4 5 of' Fig. 3-looking to the left Fig. 6 is a view similar to Fig. 3 but repnt ly positioned. The tool or appliance by whichpreferably I practise my invention may be of any I under pressure may be that in this embodiment of suitable material, butv preferably it is metallic. The body 1 thereof may be of any suitable form and preferably is provided with a handle or extension 2 integral there with and having a passage3 for-the coating material, such, for example, as paint, and a passage 4 for the propelling agent, which preferably is a, fluld under pressure, such,

for example, as air. a

The coating material and the motive fluid received from any suitable source of supply, it being desirable Specification of Letters Patent.

tool, 1s ofa general or other motive fluid.

the invention the coatingmaterial'shall itself be supplied under pressure.

A A In thedisclosed aim of my invention, the

pistol form having an elongated handleor body pprtion 1, but the construction maybe widely-varied within the scope and purpose of. theinv-ention.

If desired, paint or other coating preferably I do not rial wholly through the coating passage 3 to substantially the forward end of the tool to which I apply a cap 5 internally threaded as indicated at 6 Patented J uly29, 1919. Application filed December 30, 1918. Serial No.

.I may provide a valve for the supply passage 3, butemploy sucha valve, but control the passage of the coating mate- 5 the admission of the air Therefore, I extend and received upon the threaded end 7 of the tool. Preferably I provide the cap 5 with a removable lining or member 8 of Suitable material, such assteel, which may be replaced when worn. The lining or member 8. thus constitutes a part of the'cap. As shown most. clea'rl in Figs. 3 and l, the cap 5 or the removab e lining 8 thereof is provided with'an inner annular cavity-9 and an outer similar cavity 10, which are in communication by means of a plurality of substantiallyrradial passages 11. herein shown as slightly forwardly inclined.

-'Prefera ly the coating material which is supplied through the passage 3 (herein shown as lined) is forced under pressure into the outer annular passage 10 from which it is forced under pressure into the inner annular passage 9, the pressure upon the coating material being in this embodiment of my, invention-equal at least to the pressure of the compressed air.

-The compressed air in SllOWILtS lined) tool and preferably into-a valve chamber 12 having a prolongation 13 extending to the cap 5 so as to, admit the motive fluid to the cap from which it is expelled through the valve controlled opening 1%.

'While any suitable valve means may be employed, I have herein represented a spindle 15 which is guided at or near its forward end in any suitable manner as by means of spaced lugs 16 formed upon the spindle. The tip end of the spindle is preferably ta-- passage 4 (also hereleads into the head of the pered as indicated at 17, and the paint or I other coating material is received upon the tapered or t1p end of the spindle in a thin la'yerto' be discharged therefrom by the air or other motive fluid under pressure.

reception of The spindle 15 is provided with a pistonlike "member 1'8. For that purpose I have represented the rear end of the spindle as threaded at 19, and as receiving a plurality of disks 20, 21, the disks 20 being preferably metallic washers and the disks 21 being preferably leather or like material compressed between the "disks ZOand held inposition by a nut 22. The rear end of "the spindle '13 has a cross groove 23 for the reception of a screw driver.

The rear end of the chamber 12' is internally threaded as represented at 24 for the a threaded nut 25 closing the piston chamber, andinterposed between the piston l8 and'the nut 25 is a coiled spring 26, one end of which is herein shown as received within an annular groove27 in the inner face of the nut 25.

Preferably I provide an, axial screw 28 having a knurled adjusting head 29, and I provide a lock nut 30. By adjusting the screw 28, I limit the extent of movement of the spindle 15 under the influence of the com= pressed air supply. The screw 28 also serves as a lock wholly to prevent the operation of the apparatus, this being effected by retating the screw until its inner end contacts with the inner endof the spindle 15 when the latter is in the position shown in Fig. 3.

In accordance with my invention, I provide means whereby the air or other motive fluid may be supplied to one or both sides of the piston 18 according as it is desired to discharge the coating material or to prevent its discharge. For this purposeI have herein represented a valve chamber 31 which communicates by means of a passage 32 with the main air supply passage l and by means of a passage 33 with the valve chamber-12 between the piston 18 and the nut 25. Within the valve chamber 31, I position a ball or other suitable valve 34. The valve chamber 31 is tapped as indicated at 35' for the reception of a screw plug 36 having a beveled inner face 37' for the reception of the ball valve 34:. vided with an axial passage 38 within which is slidingly received a spindle 39.

Thespindle 39 is controlled in any suitable manner and preferably by means under the control of the hand of the user of the apparatus. For this purpose, I have herein represented the body 1 as having the handle portion 2 to which is pivoted at 40 a lever 41 which may be engaged by the palm' of the hand, so as to press it inward against the outer end of the spindle 39. When the pressure of the palm is relaxed, the lever 41 is moved outward in any suitable way,

as by position upon a pin handle 2 of the tool.

the parts assume t descriptive The screw plug 35 is pro-" posed area at piston 18, View is forced for discharge of the terial. I

When pressure is applied to the Z1,

he position shown in 1 i to the 6, the air moving the piston valve position shown in Fig. 6, thereby permitting the air to sweep forward along the tapered end of the spindle valve 15 and to terial when the alr supply is cut oil.

The coating material supplied to the discharge the thin layer of coating material through the opening 14: toward the surface to be coated or otherwise treated.

26 acts to force the spindle tapered end of the spindle valve 15 is dis charged therefrom by the compressed air and in such discharge is broken into very minute particles. The fineness 'ofthe division of the coating material depends upon the velocity of the air or other motive fluid that is supplied through the passage 4.

Having thus described one illustrati e embodiment of my invention, I desire it to be understood that although specific terms are employed, they areused in a generic and sense and not for purposes of limitation, the scope of the invention bein set forth in the following claims.

Claims:

1. Means for applying coating comprising. a body member having passages for coating material and for a motive fluid under pres-. sure, and valve means controlling the flow of motive fluid, and thereby to actuate a valve positively to control the flow of. the

tive fluid.

8. Means for applying coating comprising a body member having passages for the coating material and for the motive fluid,

a piston valve controlling the flow of the coating material and the motive fluid, and means whereby the piston valve is controlled by the flow of the motive fluid.

l. Means for applying coating comprising a body member having passages for the coat ing material and for a motive fluid under ressure a spindle val e having a tin or- A J I I a valve controlling the flow of the said vterial, and means tion to receive a layer of the coating ma controlled by the flow .of the'motive material to govern the position of said piston valve and to eii'ect'the discharge of the coating material from the tip thereof. 5. Means for applying coating comprising a body member havingpassages for the coating materiaiand the motive fluid, a piston valve controlling the discharge of the'cOating material and the motive fluid, and valve controlled means for admitting the motive fluid 'to either face of the piston,- thereby to control the position of the piston valve.

6. 'Means for applying coating comprising a body 1 having passages 33, 4, and a valve 15' having a piston 18 and valve controlled means, for supplyingv motive material to eit er face of the piston.

-7. Means for applying coating -comprising a body member having passages for the flow of coating material and for the motive fluid under pressure, a spindle valve adapted to be operated by the motive fluid'and a manually controlled valve for governing the spindle valve by means of the flow of the mo tive'fluid to said valve;

8. Means for applyingcoating comprising a body member 1 having passages 8, 4:, a spindle 15 having a piston 18, a passage 33 for admitting motive materialto the rear face of the piston and a ling the passage 33. I

9. Means for applying coating comprising a body member having passages for the coating material and the motive fluid under pressure, a valve controlling the flow of both the motive fluid and the coating ma terial, and means structurally distinct from said valve to lock said valve in closed position. i V 1 10. Means for applying coating material comprising a body member 1 having passages for coating material and for motive piece Q, and a lining member Shaving inner passages" for the coating material and the 12. Means for applying coating comprising a body member 1' having passages 3, 4 for the coating material 'and the motive fluid, a piston valve 15 having a piston 18, a spring 26, and means for admitting motive fluid to either face of the piston,

13. Means for applying coating comprising abody member 1 having passages 3, at

valve 34 for controldischarge, and means under pressure,

under pressure, and

means whereby the flow of. the coating material is cut off at the point of ultimate disface so as to force the coating material therefrom, and to discharge it in a finely divided state against the surface to be coated.

15. That method of applying coating to surfaces comprisingforming a thin coating Of'the coating material upon a preliminary surface at a-point in proximity to a restricted outlet and supplying air under pressure longitudinally of and along said preliminary surface, so as to discharge the material, from said preliminary surface through said restricted outlet in a finely divided condition andcontrolling, at the point of ultimate discharge, through air pressure,

the flow of the coating material.-

16. Means for applying coating comprising a body member having passages for coating material and for a motive fluid under pressure, a valve at substantially the point of ultimate discharge, andmeans whereby the flow of one of saidagencies operates said valve.

17. Means for applying coating comprising a body member having passages for coating material and for a motive fluid under pressure, a valve at the point of ultimate discharge, and means whereby the flow under pressure operates said valve.

18. Means for applying coating comprising abody member coating material and for a motive fluid, a valve at substantially the point of ultimate whereby the flowof one of saidagencies operates said valve.

19. Means for applying coating comprising a body member having passages for coating material and for a motive fluid and a valve at substantially the point of ultimate discharge, and there governing the discharge both of the coating material and the motive fluid and controlled by the flow of one of said agencies.

20, Means for applying coating comprising a body member having passages for coating material and for a motive fluid manually controlled charge through the flov? of one of said agencies.

21. lilieans. for applying coating comprishaving passages for' inga body member having passages for coating material and for a motive fluid under pressure, and means whereby flow of the motive material is utilized to cut ott the flow of the coating material at the point of ultimate discharge.

22. Means for applying coating comprising a body member having passages for coating lnaterial and for a motive fluid under pressure, said body member havinga relatively large, annular chamber adjacent the point of ultimate discharge, for the coating material, a spindle valve extending through said chamber. and means including a motive fluid operated valve to control a stream of motive fluid along said spindle valve, so asto traverse said chamber and discharge the coating material theretrom' in a finely divided condition.

ing a body member coating material and 23. Means for applying coating comprising a body member having passages for coating material and for a motive fluid under pressure, means to supply-coating material, means to supply motive fluid under pressure, and valve means for the coating materialactedupon loy the pressure of the motive fluid, to change the effective position of the valve means. r

24. Means for applying coating comprishaving passages for for a motive fluid and means whereby the flow of one of said agencies is utilized to coating material at the point of ultimate discharge.

In testimony whereof, I have signed my name to this specification. I

' HARRY O. DAVIS cut off the flow of the- 

